Sounds like it reacted in the jar which would explain why there wasn't a chemical reaction in the tub because it was already neutralized. The culprit is likely the EO.
What you can do is add the EO to everything but the CA, mix well, and dry out on a baking sheet. If you live in humidity you'll have to use a fan or dehumidifier because I've found no matter what I do moisture finds its way into my mix. Just before packaging, mix in the CA. Hopefully by this time the EO will have fully absorbed into the mix so it won't trigger a reaction. However, I've found that even opening it up next to a hot bath and closing it again is enough moisture to cause it to react in the jars. What worked best for me were smaller single serving packaging options.
I see now you're also in FL. This will likely be an ongoing problem for you. Sadly I've been unable to make bath bombs or bath salts work for me here without there being a constant battle with humidity. Some people on here fare better with the humidity so it is possible and there is great advice to be had when doing a search through older posts. Bath melts did well for me and still provide fizz while also giving some nice moisturizing qualities to the bath. Interested to hear how others battle the humidity. I felt this post deeply, good luck!